Use the 1Kz tone of the Hall noise generator. As I wrote previously, it's tunable...

...just like a sinewave generator. Here it is, hard at work helping to break-in the new caps in my crossovers and amps.

I bought this in the 1970s, so it has almost 40 years of finger grime accumulated on it. :-)
----------Tin-eared audiofool, large-scale-Classical music lover, and damned-amateur fotografer. William Bruce Cameron: "...not everything that can be counted counts, and not everything that counts can be counted."

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